Aural Implants are essentially all variations on two systems. Either the common enhanced hearing, or the much more complicated sensitivity to devise echolocation.
Aural implants that enhance hearing are basically microcomputers that replace the traditional ear-drum. In addition to allowing the user to more clearly define all their hearing, it also usually comes with failsafes against hearing damage. Aural implants are more effective at filtering noise, distinguishing conversation or proximity of sound, and particularly sophisticated ones are capable of instantaneous recording.
Aural implants tend to be slightly bulky, and are often accompanied by a cerebral package which can be visible just behind the earlobe.
Echolocation packages are considerably more sophisticated. They allow the user to pinpoint origination and proximity of sound, often transmitting such information directly into a cerebrum.